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A. S. CARTWRGFHT. TIRE VALVE. No. 597,954I Patented Jan 25,1898.

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A. S. GARTWRIGH'T. TIRE VALVE. No. 597,954. Patented Jam. 25,1898.

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UNITED STATES PATENT AARON SMITH CARTWRIGHT, OF BIRMINGHAM, ENGLAND.

TIRE-VALVE.

SPECIFICATION forming part of Letters Patent No. 597,954, dated January 25, 1898. Application led February 13, 1897. Serial No. 623,252. (No model.) Patented in England December 2S, 1896, No. 29,762.

To all whom t may concern.-

Be it known that I, AARON SMITH CART- 'WRIGHTnnanufactu rer, a subject ofthe Queen of Great Britain, residing at Ford Street, Hockley, in the city of Birmingham, England, have invented certain new and useful Improvements in Tire-Valves, of which the following is a specification, and for which application for Letters Patent of Great Britain has been made, dated December 28, 1896, and numbered 29,762. p 4 This invention relates to the valves of pneumatic tires, and has for its object the production of an eficient valve which is easily and cheaply produced and not liable to become deranged by use.

Figure 1 of the accompanying drawings rep,- resents a pneumatic tire fitted with a valve constructed and arranged according to my invention. The said valve is shown in action as when inde-ting and with the flexible connection of the air-pump attached. Fig. 2 represents a vertical section of the said valve upon a smaller scale, showing the same in its normal condition or when in use afterv inflation has been completed. Fig. 3 represents a like view as Fig. 2, but with the same drawn upon the same scale as :Fig 1. Fig. 4 is a crosssection of Fig. 3 upon the dotted line se. Fig. 5 shows the said valve in 'the act of being deiiated upon the same scale as Fig. 2, and Fig. 6 represents the disassembled component parts of the valve.

The same letters of reference indicate coi responding parts in the several figures of the drawings. f

The said improved valve comprises a valvestallr c., having a head end c', an outside screwed stem a?, and an axial hole a3 up its middle, wherein a pusher-stalk b, terminated by a head end b', freely slides, the said head o having stretched over it an india-rubber facing or bed c, which forms the primary seating to the valve, While completely inclosing the said facing c and the pusher-head b', which head serves as a secondary valve and whose under side b2 normally seats itself upon `the surrounding edges c of the said bed c, is a distensible and collapsible chamber, sack, or diaphragm d, having piercings d made through its walls, wherethrough air passes either into or out of the tire, according as to Whether the outer chamber is lifted from its seating byair-pressure in the act of infiation or by the pusher (forced up the valve by hand)I in order to'deiiate the tire. The feet c'2 cl2 of both seating and outer chamber, and also the Walls of the inner tube c of the tire, are gripped between the under side a4 of the stalk-head a and a metallic Washer f and nut f', screwing upon the outside a2 of the stalk or stem and the rim g of the wheel, the said rim coming between the said nut j and a lock-nut h, also screwing upon the stalk or stem, and with a leather or rubber Washer h2 coming between the nut b and the screwed- 0n dust-cap or cover c'.

In Fig. 1,3' is the metallic end fitting of the flexible connection j', ,which couples yup the valve and inflater.

The outer face of the external chamber may be reinforced with a small patch of canvas at d3 to prevent overdistention and bursting of the same.

Operation: Assuming that air under pressure is being forced into the valve from an ordinary inflater, then it passes up the space between the inside Walls of the hole in the valve-stalk and the pusher-stem and exerts itself upon the under side of and lifts the pusher-head, which in turn presses upon the middle of the inner side of and raises the outer chamber or diaphragm from ed its seating or bed and leaving clear the holes through its walls for the passage of air into the interior of the tire. The return stroke of the inflater relieves the external pressure,and the internal pressure of air in the tire now expends itself upon the outside walls of the outer chamber or diaphragm and presses both it and the head of the pusher forcibly down upon their seating, thus forming a trap or check against the outward escape of air. This operation is repeated until the tire is fully inflated.

In order to deflate the tire, it is only necessary to press upward the valve-stalk, when the outer sack or lieXible overlay chamber is distended, as seen in Fig. 5, and the air can freely escape through the piercings or holes, which have been lifted from contact with the seating.

Fig. 7 represents the stem, head, iexible diaphragm, and the bed or seating of a modified form of valve. c. is the valve, a' its IOO the same as the first-described and preferredl form of my invention.

It is obvious that instead of the diaphragm and its bed or seating being made of one piece and alike unto a collapsed chamber it may be made of two disks of india-rubber, the upper one being pierced and the other comf ing underneath and forming the bed. It must the naked metal of the head by the inner pressure of the compressed air in the tire, as represented in Fig. 8,would be sufficient to form a sound check against the escape of air.

In Fig. 8, d is the head of the valve d. a3 is the axial bore of the same. b is the pusher and b the pusher-head, while d is the outer chamber or diaphragm, pierced with air-holes cl and bedding itself directly upon the outer face a5 of the said stem-head a.

Having fully described my invention, what I desire to claim and secure by Letters Patent is- 1. In a valve for pneumatic tires, the combination with a hollow stem having a head at one end located within the tire, an elastic sack or diaphragm inclosing the said head and having a contracted mouth located between the stantially as set forth.

3. In a tire-valve, the combination with the valve-body a, having a head a at one end provided with a convex outer face and an axial bore a3, extending through said valve body and head, of a distensible diaphragm d, pierced with air-openings, said diaphragm inclosing the head and having the air-openings arranged to seat upon the convex face thereof, substantially as described.

4. In a tire-valve, the combination with a valve-body a, having an axial bore a3, and a head end a", faced with an elastic seating or bed o, of a distensible chamber or diaphragm d, pierced with air-passages d', and inclosing said seating c, and valve-head a', substantially as described and set forth. Y'

5. In a tire-valve, the combination with a valve-body d, and head end a', faced with an elastic seating or bed c, and inclosed within a distensible chamber or diaphragm (Z, pierced With small airspassages d', of a pusher 7J, Whose head end b', 'is inclosed Within and comes against the inside of, the said diaphragm d, While the stem or shank of the same lies Within and extends beyond the open end of the bore a3 of the said valve-body a, substantially as described and set forth.

6. In a tire-valve, the combination with a valve-body a, its head end a', located within the interior of a tire inner tube e, and faced with an elastic seating or bed c, pierced diaphragm or chamber CZ, inclosing same, and pusher b, b', for distending said diaphragm when required to deiiate the tire, of the nuts f', h, and washers f,.h2, for securing said valve to the tire-tube e, and Wheel-rim g, substantially as described and set forth.

7. A valve for pneumatic tires comprising an elastic sack or diaphragm having a throttled or contracted mouth end, which is drawn over the head or iiange of an axially-bored valve-stem, and is clamped between the under side of the said head and the inside of the tube or air-chamber of a tire by a nut and Washer threaded upon the said stem, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses.

AARON SMITH CARTVRIGHT.

W'itnesses:

HENRY SKERRETT, ARTHUR T. SADLER. 

